This peice has only 8 colors plus transparency, not 11. You have plenty of room to make the dress a more oceanic blue.
Also, actual black can work against you as some programs will read it as alpha. Try a dark green that is indestinguishable from black to the naked eye.
Transparency is required for the background, but you can keep your current image for the preview. And the dithering works on the hair it give a bit of texture. Not sure about the bit on the stomach area though :)
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Weekly Challenge: Mother Nature
This peice has only 8 colors plus transparency, not 11. You have plenty of room to make the dress a more oceanic blue.
Also, actual black can work against you as some programs will read it as alpha. Try a dark green that is indestinguishable from black to the naked eye.